The Late Oligocene–Early Miocene Marine Transgression of Patagonia

Encinas, Alfonso; Folguera, Andrés; Bechis, Florencia; Finger, Kenneth L.; Zambrano, Patricio; Pérez, Felipe; Bernabé, Pablo; Tapia, F.; Riffo, Ricardo; Buatois, Luís A.; Orts, Darío; Nielsen, Sven N.; Valencia, Victor; Cuitiño, José Ignacio; Oliveros, Verónica; Mauro, Lizet De Girolamo Del; Ramos, Víctor A.

doi:10.1007/978-3-319-67774-3_18

Cited by 14 publications

(28 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ipún beds have not yet been investigated for such data. Sediments of shallow-water origin were re-deposited at greater depth, occurring intercalated with deep-water sediments (Encinas et al, 2008(Encinas et al, , 2018Finger et al, 2007). The otoliths described here were mostly obtained from the same localities as those reported in previous studies dealing with mollusks and foraminifera (e.g., Finger, 2013;Kiel & Nielsen, 2010;Nielsen & Glodny, 2009).…”

Section: Geological Settingmentioning

confidence: 84%

“…Geological units further south that have been shown to correlate with the Navidad Formation are the Ranquil Formation on the Arauco Peninsula just south of Concepción, the Lacui Formation of Chiloé Island, and the Ipún beds of the Chonos Archipelago. All these units share macrofaunal composition (Kiel & Nielsen, 2010;Philippi, 1887;Villafaña et al, 2019) and geological history (Encinas et al, 2018), and all, with the exception of the Ipún beds, also share the same biostratigraphic age (Finger, 2013), microfaunal composition (Finger, 2013;Finger et al, 2007), and strontium isotope age (Nielsen & Glodny, 2009). The Ipún beds have not yet been investigated for such data.…”

Section: Geological Settingmentioning

confidence: 99%

“…Nielsen and Encinas (2014) provided a general description of the sequence, which mostly consists of sandstones, and interpreted the depositional environment as having deepened considerably through time from its base on Stokes Island to the highest parts on Ipún Island. The name Ipún beds was informally used by Encinas et al (2018), who analyzed that unit in a broader geological context. Frassinetti (2001Frassinetti ( , 2004 described the mollusk fauna, which contains several warm-water taxa (Nielsen & Ampuero, 2020;Nielsen & Frassinetti, 2007b;Nielsen & Glodny, 2009;Rojas & Nielsen, 2020) and is generally similar to the units described above (Kiel & Nielsen, 2010).…”

Section: Ipún Bedsmentioning

confidence: 99%

See 2 more Smart Citations

Fish otoliths from the early Miocene of Chile: a window into the evolution of marine bony fishes in the Southeast Pacific

Schwarzhans

Nielsen

2021

Swiss J Palaeontol

Self Cite

View full text Add to dashboard Cite

Few fossil fish otolith associations have been described from the Pacific side of the Americas and, except for a single species (Steindachneria svennielseni), none have been described from Pacific South America south of the Central American tropical region. Here, we describe a rich otolith assemblage obtained from fifteen early Miocene outcrop locations along the Chilean coast from about 33°S to about 45°S. More than 2,000 specimens were studied resulting in the recognition of 67 species, with 27 being new to science. This assemblage represents an important new data point distant from any previously known otolith-based fish fauna, with the nearest coeval associations being from the Caribbean Province in Venezuela, which lies about 5000 km to the north, and New Zealand, which is about 9000 km to the west. The fauna represents a mixture of offshore and shallow water fishes and is rich in myctophids, paralichthyids (Citharichthys), ophidiids (Lepophidium), steindachneriids, and macrourids. Typical tropical American fishes are nearly completely absent, with the exception of Steindachneria and certain anguilliforms. The mesopelagic faunal component, chiefly Myctophidae, shows a striking resemblance to the well-known coeval fish fauna from New Zealand, and both are interpreted as representing an early South Pacific mesopelagic bioprovince. The strong correlation with the mesopelagic otolith-based fish fauna from New Zealand constricts the time interval of the sampled sediments to the middle Burdigalian (approximately 17.5 to 18.5 Ma). All otoliths obtained from the early Miocene of Chile relate to extant fish groups of the area and few exotic components not currently present in the East Pacific. The sole exception is a morpho-type described as Navidadichthys which has an unresolved relationship, possibly with the Prototroctidae, a family that is today endemic to the freshwater and nearshore marine environments of Australia and New Zealand. The new taxa are in the sequence of taxonomic description: Pterothrissus transpacificus n. sp., Pythonichthys panulus n. sp., Chiloconger chilensis n. sp., Gnathophis quinzoi n.sp., Rhynchoconger chiloensis n. sp., Navidadichthys mirus n. gen. et n. sp., Maurolicus brevirostris n. sp., Polyipnus bandeli n. sp., Lampanyctus ipunensis n. sp., Physiculus pichi n. sp., Coelorinchus fidelis n. sp., Coelorinchus rapelanus n. sp., Nezumia epuge n. sp., Paracarapus chilensis n. gen. et n. sp., Lepophidium chonorum n. sp., Lepophidium mapucheorum n. sp., Sirembola supersa n. sp., Spectrunculus sparsus n. sp., Pseudonus humilis n. sp., Capromimus undulatus n. sp., Agonopsis cume n. sp., Cottunculus primaevus n. sp., Kuhlia orientalis n. sp., Citharichthys parvisulcus n. sp., Citharichthys vergens n. sp., Achirus australis n. sp., Achirus chungkuz n. sp.

show abstract

Section: Geological Settingmentioning

confidence: 84%

Section: Geological Settingmentioning

confidence: 99%

Section: Ipún Bedsmentioning

confidence: 99%

See 1 more Smart Citation

Fish otoliths from the early Miocene of Chile: a window into the evolution of marine bony fishes in the Southeast Pacific

Schwarzhans

Nielsen

2021

Swiss J Palaeontol

Self Cite

View full text Add to dashboard Cite

show abstract

“…Even though marine ingressions covered wide areas of southern South America during late Oligoceneearly Miocene times as result of regional extension (see Encinas et al, 2018 for review), deep-marine sedimentation together with the generation of quasioceanic crust is restricted to the LOFZ domain (Hervé et al, 1995;Silva et al, 2003;Hervé et al, 2017). Although more studies should be carried out to understand the associated mechanisms in detail, the crustal scale discontinuity represented by the LOFZ appears to have played an important role during early-to-mid Cenozoic magmatic activity, and the opening and subsequent closure of basins in the western slope of North Patagonian Andes.…”

Section: Resultsmentioning

confidence: 99%

“…In Aysén, early-mid Paleogene volcanic and sedimentary rocks are mainly located east of the Andean Cordillera, near the Chile-Argentina international border (Fig. 2), and have been interpreted as formed in an extensional setting (e.g., Encinas et al, 2018). In particular, alkaline basalts in the Chile Chico-Balmaceda area have been related to the development of an asthenospheric window associated with Eocene subduction of the Aluk-Farallon seismic ridge below this portion of South America (Espinoza et al, 2005).…”

Section: Local Geologymentioning

confidence: 99%

Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile

Quezada

Hervé

Calderón

et al. 2021

andgeo

View full text Add to dashboard Cite

Previously undated low-grade metamorphic rocks from the Puerto Cisnes-Queulat area (44°30’ S) contain detrital zircons of mid-Oligocene age (ca. 28 Ma). Their outcrops represent the easternmost occurrence of the late Oligocene to early Miocene marine volcano-sedimentary Traiguén Formation; previous correlation with the Paleozoic metamorphic basement of this sector of the North Patagonian Andes is thus refuted. A similar age and provenance were obtained for a paraconglomerate bed of the La Junta Formation ca. 80 km to the north, which is thought to represent a high-energy lateral facies variation of the Traiguén Formation. Miocene plutonic rocks of the North Patagonian Batholith intruded these metasedimentary rocks, generating a contact metamorphic aureole that reaches biotite grade and overprints a previous metamorphic fabric probably formed during closure of the Traiguén Basin. Similar young ages for metamorphic rocks located immediately west of the Liquiñe-Ofqui Fault Zone 300 km north, near Ayacara, suggest a regional pattern of earliest Neogene metamorphism and rapid exhumation in this segment of the Patagonian Andes.

show abstract

Tectonosedimentary evolution of the Coastal Cordillera and Central Depression of south-Central Chile (36°30′-42°S)

Encinas

Sagripanti

Rodríguez

et al. 2021

Earth-Science Reviews

View full text Add to dashboard Cite

The Late Oligocene–Early Miocene Marine Transgression of Patagonia

Cited by 14 publications

References 56 publications

Fish otoliths from the early Miocene of Chile: a window into the evolution of marine bony fishes in the Southeast Pacific

Fish otoliths from the early Miocene of Chile: a window into the evolution of marine bony fishes in the Southeast Pacific

Mid-Cenozoic SHRIMP U-Pb detrital zircon ages from metasedimentary rocks in the North Patagonian Andes of Aysén, Chile

Tectonosedimentary evolution of the Coastal Cordillera and Central Depression of south-Central Chile (36°30′-42°S)

Contact Info

Product

Resources

About